Why is my Lumia 1020 showing blurry pics in the photos folder?

when I click a picture with my lumia 1020 using the lumia camera app and see its preview in the preview option, the image quality is very stunning and dynamic. but as soon I close the lumia camera and see the picture in photos, the image gets a bit blurry and loses calrity. does this happens with your lumia or am I the only one? please help.